Reminds me of heuchera.

Could be? There's a native one but apparently it has red stems:

Washington Native Plant Society : Heuchera Micrantha

I wouldn't mind something else I can leave in place, like the clover and the Petasites Palmatus...

I think it's Mitella.

That definitely looks like it, but according to the US Wildflower Database it's only supposed to be in the eastern side of the US and I'm in Washington State. And it's all over here. Doesn't mean that's not right though.

US Wildflower Database : Mitella diphylla

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Edit: Maybe Mitella stauropetala?

US Wildflower Database : Mitella stauropetala

Oooh, that looks right. So the big question is, keep it? Or will I live to regret that?

I'm trying to pick my battles here. I'm already in a fight to the death with English ivy, blackberry, morning glory and creeping buttercup (Ranunculus repens)...

It's native to N America. In the light of all the invasives you have I'd leave it alone. You have Equisetum right behind it - you'll need all your energy for stuff like that.

Yeah tellima. It spreads nicely and is native and attracts native wildlife. If you collect the seeds, you can show them all I one area and have a little patch of 100 of them which looks much better than just one random tellima.

floral is correct - Tellima grandiflora is common PNW native wildflower, popping up usually in somewhat shady locations (although it will grow just about anywhere). It is of no concern unless it is growing somewhere you do not want. I also would have far more concerns about the horsetail (Equisetum) and the other invasives you are dealing with.

Oh we grow a grand crop of Equisetum every year. I actually consider them benign compared to my nasty invasives. I do pull them, don't get me wrong, but they're far from the top of my kill list.

We bought this property two years ago. It hadn't been lived in for 15 years or so, and it's surrounded by unmanaged land full of invasives. I finally got a new neighbor that gardens (hooray!) on one side, but just managing our own property is pretty much a full time job and then some. Eventually I will at least have IDs for all the plants and know what to keep and what to fight. Thanks guys!

And don't worry Macranthos, I have big patches of the Tellima grandiflora. This lone one was just the closest one to my back door. :)